\begin{tikzpicture}
    \tkzDefPoints{0/0/B, 3/0/C, 4/0/B', 5.5/0/C'}
    \tkzDefTriangle[two angles=50 and 70](B,C)  \tkzGetPoint{A}
    \tkzDefTriangle[two angles=50 and 70](B',C')  \tkzGetPoint{A'}
    \tkzDefPointBy[translation=from A' to B'](A)  \tkzGetPoint{D}
    \tkzDefPointBy[translation=from A' to C'](A)  \tkzGetPoint{E}

    \tkzDrawPolygon(A,B,C)
    \tkzDrawPolygon(A',B',C')
    \tkzDrawSegment[dashed](D,E)
    \tkzLabelPoints[above](A,A')
    \tkzLabelPoints[left](B,D,B')
    \tkzLabelPoints[right](C,E,C')
\end{tikzpicture}

